An envelope flap is a flap that is elevated from a horizontal linear incision, parallel to the free gingival margin, with no vertical incision. It may be either sulcular or submarginal. The envelope flap has been found to create less inflammation following a procedure than other similar types of flaps, such as the triangular. Though other factors of the triangular and envelope flaps are almost the same, the envelope flap is often recommended since it produces less inflammation. The envelope flap gets its name partly due to the method used to close the flap following surgical procedures. The ends of the gingival flaps are positioned and folded against the surface of the roots and then folded like an envelope. The envelope flaps are then held together by sutures or another closing technique. A dressing may also be applied following the flap closing to hold them in place and allow further healing to ensue.